A wild bird in Australia has apparently added a new weapon to his feathered arsenal. Getty Images/Ken Griffiths The other day ...

Rubber bands do the exact opposite ... transfer the thermal energy from the bands to the air. The whole thing is hand cranked, so this would make a perfect museum or educational demonstration.

Flexible filament like TPU is one option, but [NagyBig] designed a simple bracelet to ask: how about embedding rubber bands or o-rings into the print itself? Embedding objects into prints usually ...